The capacitors that I replaced were near the large heat sink on the power board. They were radial capacitors. Looking at them I noticed that the metal end of the capacitor was dome shaped and not flat. I figured what do I have to loose and replaced them. The voltage and size of the capacitor is usually identified on the side.
Hope this helps.
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The most common problem with LCD monitors is the backlight.
After a few years of operation the electrolytic capacitors on the power supply fail and the monitor can not be powered on or the backlight is not working.
To fix it you must open the monitor and locate the power supply. Visually inspect all capacitors if they are in good condition.
Faulty capacitors are deformed.
Replace any deformed capacitor in the area with the red circle. Replace also the capacitor on the green circle. Its a small capacitor rated at 50 or 63 or 100 volts. This capacitor is responsible for the backlight circuit. Usually this small capacitor fails but does not deform and its hard to tell if its ok or not.
The light comes from 4 luminiscent tubes. They are empowered by high-voltage power suppy. There is a circuit, that continuously monitor the lamps and the quality of the power from the low-voltage power supply. Either there is a faulty light tube, or there are inflated capacitors on the LVPS. First one is hard to repair due to need to open the LCD itself, which is hard and dangerous, the light tubes are hard to find and LCD is hard to clean perfectly when closing and appear dirty spots on the screen. The second one is easy - visually inspect the capacitors and if their top is not flat, then replace all of them with the relevant capacitance. I suggest to use capacitors for higher voltage (35V) thus making the PS lasting forever.
you need to repair or replace the power supply, the blinking means that the the voltage is not constant so it can be a problem of defective capacitors: 1000uF 16 et 470uf 25V, you have to take it to professionnel technician because it is dangerous for you, there is a hight voltage inside the monitor but if you have some knewledge about electronic and hight voltage you can do it by your self.
For the above LCD Monitor, I actually saw a small spark at the top part
of the main board once the power input jack was connected. It prompted
me to the exact location and when I check the SMD ceramic capacitor
(that generated the spark underneath it) with analog meter set to X 10
K ohm range; it actually developed a slight short circuit. Replacing
only the fuse and the SMD ceramic capacitor solved the no power problem
in this 19" LCD Monitor. This Monitor uses the inverter IC (OZ960G),
A1084-25CM (2.5 volts voltage regulator), AMC1117-3.3 (3.3 volts
voltage regulator), ADC IC (MST8136B) and CPU IC (MYSON MTV312MV64).
I had the same problem with my 22" X2Gen, first the monitor started what looked like a random color temperature shift, ie the screen would switch between a yellowish and blueish tint, then it wouldn't turn on and the amber standy by light flashed on and off. I took it apart and replaced the 2 220uF25V capicators with 2 220uF35V caps I got at radio shack, part number 272-1029. Don't worry about the voltage mismatch I'm pretty sure it doesn't matter, the voltage is the maximum the cap can withstand and has nothing to do with the voltage in the circuit. The caps are located on the board that the AC cord plugs directly into, it has a plastic (almost feels like paper) sheild, the caps are marked C812 and C813 on the circuit board. There was no 47uF35V cap that I could find, anyway replacing the two did the trick, all for under $3, I almost went out and bought a new monitor ;) Hope that helps.
Most likely you have degraded electrolytic capacitors in the internal power supply. If you can disassemble your monitor to liik at the power supply board you might notice bulging capacitors which if replaced will likely restore normal function.